once you have beat misty in cerealean city go to lavender town go to the radio station and talk to a old man he will say thanks for saving the power plant and he upgrade your pokegear and there you...
You can't get one. However, if you have solved the crisis at the Power Plant and received the EXPN card at the Lavender Radio Tower, you can move the blinking dot on the radio to the top star and it...
You don't actually get it it's after you get the kanto radio card from the guy in the lavender town radio tower. set the radio to the top middle and there will be pokeflute. hope this helps!
first go to kanto power plant talk to the manager next go to cerulian city go to the gym theres a team roket member you have to go after him to to the bridge batle him ( he has a level 30 golbat )...